package com.upcode.weighing.util.excel;

import org.apache.commons.codec.binary.Base64;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;

public class BASE64DecodedMultipartFile implements MultipartFile {


    private final byte[] imgContent;
    private final String header;

    public BASE64DecodedMultipartFile(byte[] imgContent, String header) {
        this.imgContent = imgContent;
        this.header = header.split(";")[0];
    }

    @Override
    public String getName() {
        return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
    }

    @Override
    public String getOriginalFilename() {
        return System.currentTimeMillis() + (int) Math.random() * 10000 + "." + header.split("/")[1];
    }

    @Override
    public String getContentType() {
        return header.split(":")[1];
    }

    @Override
    public boolean isEmpty() {
        return imgContent == null || imgContent.length == 0;
    }

    @Override
    public long getSize() {
        return imgContent.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return imgContent;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(imgContent);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        new FileOutputStream(dest).write(imgContent);
    }

    public static MultipartFile base64ToMultipart(String base64) {
        try {
            String[] baseStrs = base64.split(",");
            byte[] b = Base64.decodeBase64(baseStrs[1]);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            return new BASE64DecodedMultipartFile(b, baseStrs[0]);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    /// <summary>
    /// base64转图片保存
    /// </summary>
    /// <param name="path">保存路径</param>
    /// <param name="guid">文件名称</param>
    /// <param name="base64">图片的base64</param>
    /*public void Base64ToImage(String path, String guid, String base64)
    {
        if (path.equals("")){
            throw new Exception("未指定保存文件的路径");
        }
        base64 = base64.replace("data:image/png;base64,", "").replace("data:image/jgp;base64,", "").replace("data:image/jpg;base64,", "").replace("data:image/jpeg;base64,", "");//将base64头部信息替换
        byte[] bytes = Convert.FromBase64String(base64);
        MemoryStream memStream = new MemoryStream(bytes);
        Image mImage = Image.FromStream(memStream);
        Bitmap bp = new Bitmap(mImage);
        bp.Save(path + "/" + guid + ".jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);//注意保存路径
    }*/

    //Base64ToImage(imgpath, item.guid, item.imgurl);//调用



}
